If they really to try to stay as close to the original saga as First Class prequel let, I wouldnt mind X-men: Days of Future Past.
But if they just use that famous tittle to add Wolverine from the future and no other well known character, and do something totally different from the saga, Id say no.
I mean, the future played a big part in the saga, so if they only show a few short scenes of the future and them spent most of the time on the 60s, Id ratther get a normal First Class sequel, developing the cast to date and adding two new x-men, and develop the shool, the brotherhood evolution and another important historic event, like the first.